From: Felix Fietkau <nbd@nbd.name>
Date: Sat, 14 May 2016 14:51:02 +0200
Subject: [PATCH] Revert "ath9k: interpret requested txpower in EIRP
 domain"

This reverts commit 71f5137bf010c6faffab50c0ec15374c59c4a411.
---

--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2935,7 +2935,8 @@ void ath9k_hw_apply_txpower(struct ath_h
 {
 	struct ath_regulatory *reg = ath9k_hw_regulatory(ah);
 	struct ieee80211_channel *channel;
-	int chan_pwr, new_pwr;
+	int chan_pwr, new_pwr, max_gain;
+	int ant_gain, ant_reduction = 0;
 
 	if (!chan)
 		return;
@@ -2943,10 +2944,15 @@ void ath9k_hw_apply_txpower(struct ath_h
 	channel = chan->chan;
 	chan_pwr = min_t(int, channel->max_power * 2, MAX_RATE_POWER);
 	new_pwr = min_t(int, chan_pwr, reg->power_limit);
+	max_gain = chan_pwr - new_pwr + channel->max_antenna_gain * 2;
+
+	ant_gain = get_antenna_gain(ah, chan);
+	if (ant_gain > max_gain)
+		ant_reduction = ant_gain - max_gain;
 
 	ah->eep_ops->set_txpower(ah, chan,
 				 ath9k_regd_get_ctl(reg, chan),
-				 get_antenna_gain(ah, chan), new_pwr, test);
+				 ant_reduction, new_pwr, test);
 }
 
 void ath9k_hw_set_txpowerlimit(struct ath_hw *ah, u32 limit, bool test)
